Science may once and for all settle the heated debate over whether "the infected" in 28 Days Later could be classified as zombies.

Schlozman says "no," observing that "the infected" possess "some sort of higher cortical function going on that allows them to hunt humans." Moreover, the fake zombies in 28 Days Later exhibit fluidity of motion. They can run, jump, climb and quickly change direction-activities that the true Romero zombies are incapable of performing.

Clearly, zombies suffer from cerebellar and basal ganglia dysfunction (duh!). Those are the parts of the brain that make fluidity of motion possible. The basal ganglia helps us with coordinated movement. The cerebellum helps us with balance. In fact, if you visit the website of the National Institutes of Health and read about cerebellar degeneration (such as ataxia), the symptoms match the familiar gait of the living dead: "a wide-legged, unsteady, lurching walk, usually accompanied by a back and forth tremor in the trunk of the body…"